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United States Patent | 5,198,745 |
Larsen ,   et al. | March 30, 1993 |
A dynamic braking system resistor for stabilizing a power system during power system disturbances includes a braking resistor for coupling with a power system bus. A controller monitors a power system parameter, such as the speed of a generator coupled with the power system bus, and determine therefrom a thyristor control signal. The controller uses the power system parameter to establish a desired modulation and then provides a bias to the desired modulation. The controller conditions the biased desired modulation signal to provide the thyristor control signal. A thyristor valve responsive to the thyristor control signal couples the braking resistor with a ground potential. A method is also provided of damping subsequent oscillations on a power system following a power system disturbance using the dynamic braking resistor.
Inventors: | Larsen; Einar V. (Charlton, NY); Hill; Ann T. (Ballston Spa, NY) |
Assignee: | Electric Power Research Institute (Palo Alto, CA) |
Appl. No.: | 742881 |
Filed: | August 8, 1991 |
Current U.S. Class: | 322/58; 323/233; 323/298; 323/369; 361/54 |
Intern'l Class: | H02K 011/00 |
Field of Search: | 323/210,233,298,369 307/18,19,29 322/58 361/54 |
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4173732 | Nov., 1979 | Anderson | 318/380. |
4292545 | Sep., 1981 | Hingorani | 323/210. |
4352049 | Sep., 1982 | Franz | 318/376. |
4434376 | Feb., 1984 | Hingorani | 323/210. |
4904918 | Feb., 1990 | Bailey et al. | 318/759. |
4916428 | Apr., 1990 | Burke | 338/62. |
4999565 | Mar., 1991 | Nilsson | 323/210. |
Kimbark, E. W., "Improvement of Power System Stability by Changes in the Network, " IEEE Transactions on Power Apparatus and Systems, vol. PAS-88, No. 5 (May 1969). Shelton, M. L., et al., "Bonneville Power Administration 1400-MW Braking Resistor, " IEEE PES Summer Meeting & Energy Resources Conference, (Jul. 1974). Chee-Hing, D. J., et al., "A New Static Watt Compensator for the Iron & Steel Company of Trinidad and Tobago, " IEEE Transactions on Power Apparatus and Systems, vol. PAS-101, No. 8 (Aug. 1982). |